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    Java中Hashtable类java.util.Hashtable.toString()是Hashtable的内置方法,用于以“,”分隔的一组条目的形式获取Hashtable对象的字符串表示形式。所以基本上toString()方法用于将Hashtable的所有元素转换为String。

    句法:

    Hash_Table.toString()

    参数:该方法不带任何参数。

    返回值:该方法返回由哈希表元素的字符串表示形式组成的集合。

    下面的程序说明了java.util.Hashtable.toString()方法的工作原理

    程序1:

    // Java code to illustrate the toString() method
    import java.util.*;
      
    public class Hash_Table_Demo {
        public static void main(String[] args)
        {
      
            // Creating an empty Hashtable
            Hashtable<Integer, String> hash_table = 
                                new Hashtable<Integer, String>(); 
      
            // Inserting elements into the table
            hash_table.put(10, "Geeks");
            hash_table.put(15, "4");
            hash_table.put(20, "Geeks");
            hash_table.put(25, "Welcomes");
            hash_table.put(30, "You");
      
            // Displaying the Hashtable
            System.out.println("Initial table is: " + hash_table);
      
            // Displaying the string representaion
            System.out.println("The set is: " + hash_table.toString());
        }
    }
    

    输出:

    Initial table is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes}
    The set is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes}

    程序2:

    // Java code to illustrate the toString() method
    import java.util.*;
     
    public class Hash_Table_Demo {
        public static void main(String[] args)
        {
     
            // Creating an empty Hashtable
            Hashtable<String, Integer> hash_table = 
                               new Hashtable<String, Integer>(); 
     
            // Inserting elements into the table
            hash_table.put("Geeks", 10);
            hash_table.put("4", 15);
            hash_table.put("Geeks", 20);
            hash_table.put("Welcomes", 25);
            hash_table.put("You", 30);
     
            // Displaying the Hashtable
            System.out.println("Initial Table is: " + hash_table);
     
            // Displaying the string representaion
            System.out.println("The set is: " + hash_table.toString());
        }
    }
    

    输出:

    Initial Table is: {You=30, Welcomes=25, 4=15, Geeks=20}
    The set is: {You=30, Welcomes=25, 4=15, Geeks=20}

     
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